Testing

Hi, just wondering when testing my reassembled starter motor I assembled as it came apart so I am sure I have it all back together correct, and I might be worrying about nothing, it runs when I hold the body of the starter on the negative pole on a battery and touch the positive post on the battery but when I test the positive pole and body of the starter motor I get a very small continuity reading on the multi tester, can someone put me out of my misery and tell me that is normal.